Princess Charlotte turns 3 years old today, but it seems like she’s already had enough adorable moments to last a lifetime. The Duke and Duchess of Cambridge’s darling daughter melts our hearts with each and every new photo she’s in.

From her premiere portrait with her doting older brother, Prince George, to rosy-faced ski trip shots in which she looks just like her dad, Prince William, Charlotte truly is a royal sweetheart. Her seat of honor in Queen Elizabeth’s 90th birthday portrait sealed the deal: This 3-year-old tot has us smitten.

And while she's certainly cute, Kate Middleton says her toddler is certainly a troublemaker. "Oh, she is very cute but she has got quite a feisty side!" Middleton told attendee Glynis Double at one of the Queen's birthday celebrations, according to People. She went on to say that she hopes older brother Prince George can keep his little sister in line.

VIDEO: Princess Charlotte's Cutest Moments on Camera

In honor of her third birthday, check out the princess’s most adorable moments on camera, as we wait and see how she adjusts to her new role as a big sister. Considering how she walked into the Lindo Wing with smiles and waves, it seems like she's already loving the job.